I tried to stay away from the Narrow Gauge stuff as there are many of them. Also, the O gauge is two-rail only. I have no figures for the "hi-rail" statistics. As for the G scale, I know of three "Scales" that run on the same "Gauge" track of 45mm; 1:22.5, 1:29 and 1:30. The 1:30 is sometimes called No.1 Gauge and runs on the 45mm track, but is 10mm to the foot instead of 13.5mm to the foot like G gauge.
I also missed S scale, so here goes again. Following the same format.
Gauge: Scale: Size:
S- 12, 1:64, 4.8mm
Nn3- 6.5, 1:160, 2mm (see note #3)
OOn?- 9, 1:76, 4mm (see note #1)
HOn2.5- 9, 1:87, 3.5mm (see note #2)
HOn3- 10.5, 1:87, 3.5mm
On?- 16.5, 1:48 or 1:43.5, 6.4mm or 7mm (see note #1)
Note 1. I'm not sure what the gauge is here. Could be 2-1/2 or 3. OOn uses N gauge track and On uses HO gauge track.
Note 2. Uses N gauge track, but the actual gauge shouold be 8.7mm.
Note 3. Nn3 uses Z gauge track.
Now I'm positive I haven't hit on all the scales and gauges out there, but most of you are in N standard gauge anyway. You just like to see me work, don't you.
B-) & :x